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| Registros recuperados: 132 | |
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| Galván Escobedo, Iris Grisel. |
| El Museo Nacional de las Culturas (MNC) ubicado en el centro histórico de la ciudad de México, es un edificio que fue construido en 1734 sobre los restos de la antigua ciudad de México -Tenochtitlán habitada por los mexicas (1324-1521). En el MNC se realizaron excavaciones arqueológicas con el objeto de recuperar información histórica relacionada con el sitio, tendientes a una restauración integral del edificio y su posterior adecuación museográfica. De los trabajos arqueológicos se derivó esta tesis que tuvo como finalidad recuperar los restos vegetales contenidos en los depósitos sedimentológicos de las excavaciones arqueológicas, para establecer las condiciones paleoecológicas de la región y el posible uso de plantas. Se analizaron 50 muestras de... |
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Palavras-chave: Arqueobotánica; Sedimentos; Semillas; Maderas; Polen; Archaeobotany; Sediments; Seeds; Wood; Pollen; Maestría; Botánica. |
| Ano: 2010 |
URL: http://hdl.handle.net/10521/142 |
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| Galván Escobedo, Iris Grisel. |
| El Museo Nacional de las Culturas (MNC) ubicado en el centro histórico de la ciudad de México, es un edificio que fue construido en 1734 sobre los restos de la antigua ciudad de México -Tenochtitlán habitada por los mexicas (1324-1521). En el MNC se realizaron excavaciones arqueológicas con el objeto de recuperar información histórica relacionada con el sitio, tendientes a una restauración integral del edificio y su posterior adecuación museográfica. De los trabajos arqueológicos se derivó esta tesis que tuvo como finalidad recuperar los restos vegetales contenidos en los depósitos sedimentológicos de las excavaciones arqueológicas, para establecer las condiciones paleoecológicas de la región y el posible uso de plantas. Se analizaron 50 muestras de... |
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Palavras-chave: Arqueobotánica; Sedimentos; Semillas; Maderas; Polen; Archaeobotany; Sediments; Seeds; Wood; Pollen; Maestría; Botánica. |
| Ano: 2010 |
URL: http://hdl.handle.net/10521/142 |
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| Ramírez Cruz, Maidali Erizabeth. |
| Los incendios forestales, además de afectar la calidad del aire y la cubierta vegetal, provocan cambios importantes en las propiedades hidrológicas del suelo, aceleran el proceso de erosión y contaminan por sedimentación. Sin embargo, en México, la información relacionada con los incendios esta más enfocada a estudiar y documentar el impacto ambiental sobre la calidad del aire y la cubierta vegetal, sin ahondar en los efectos sobre el suelo , el escurrimiento superficial y la producción de sedimentos. Por tal motivo, el objetivo de este trabajo fue evaluar la severidad de la quema sobre la infiltración del agua, la producción de escurrimiento superficial y sedimentos. Se evaluaron doce tratamientos derivados de las cuatro severidades de quema... |
| Tipo: Tesis |
Palavras-chave: Severidad de quema; Sedimentos; Escurrimiento superficial; Lluvia simulada; Doctorado; Hidrociencias; Fire severity; Sediments; Surface runoff; Simulated rain. |
| Ano: 2009 |
URL: http://hdl.handle.net/10521/1292 |
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| Abdou, M.; Schaefer, J.; Cobelo-garcia, A.; Neira, P.; Petit, J. C. J.; Auger, Dominique; Chiffoleau, Jean-francois; Blanc, Gerard. |
| Platinum Group Metals (PGM) are modern, technologically relevant elements for which (i) the anthropogenic cycle has outcompeted the natural cycles and (ii) environmental behavior, fate and impact are still widely unknown. Stripping voltammetry was used for accurate determinations of platinum (Pt) in historical records of river sediments and estuarine oysters from the Gironde fluvial-estuarine continuum (SW France) comprising the Lot River. Sediment cores from the Lot River, dated from 1952 to 2001, showed past Pt contamination due to former industrial (smelter) activities in the Lot River watershed. These samples revealed the phasing-out of a historical Pt contamination with Pt/Th (Thorium) values of 11 × 10− 5 ± 0.79 × 10− 5 for the deepest part of the... |
| Tipo: Text |
Palavras-chave: Platinum; Sediments; Wild oysters; Bioaccumulation. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00311/42177/41478.pdf |
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| Guegueniat, P; Boust, D; Gandon, R; Hemon, G; Phillipot, J; Sanchez, J; Marin, P; Pieri, J. |
| This paper reports the study of iron geochemical behavior by the measurement of total iron, iron associated with mineral coat, and ratio FEII/FEIII. The results of total iron are exploited by normalisation with regard to aluminium and scandium. |
| Tipo: Text |
Palavras-chave: River discharge; Sediments; Suspended particulate matter; Ion association; Iron; Geochemical cycle. |
| Ano: 1985 |
URL: http://archimer.ifremer.fr/doc/1985/acte-1301.pdf |
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| Luoma, S. |
| It has been established that direct uptake of (at least some) trace metals from sediments contributes to metal concentrations in benthic organisms. Important controls on metal uptake from sediment are the concentration of the exposure, the partitioning of the metals among components of the sediment, and the redox potential of the sediment. Important problems in ecology, physiology, geochemistry and biogeochemistry remain unresolved, however, and a concentrated interdisciplinary research effort will be necessary before a complete understanding of the fate and impact of sediment-bound metals will be possible. |
| Tipo: Text |
Palavras-chave: Bioaccumulation; Benthos; Food webs; Biogeochemical cycle; Sediments; Availability; Trace metals. |
| Ano: 1985 |
URL: http://archimer.ifremer.fr/doc/1985/acte-1302.pdf |
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| Savoye, Bruno. |
| Sediment instability appears to be important as a part of global sedimentary budget. Among the various types of sedimentary instabilities, submarine slides are probably the most spectacular and the hardest to study and predict, although their consequences on human and industrial marine activities can be dramatic. IFREMER is conducting a research project on this topic. An area off Nice (France) has been particularly studied because of its recent activity. Mapping and instability area detection have been carried out. With the possibility of direct interactive observation and highly accurate submarine in -situ operation, the submersible is an extremely efficient tool for sediment studies, but diving purposes have to be precisely defined to provide useful... |
| Tipo: Text |
Palavras-chave: Sediments; Instability; Sedimentology; Sedimentary structures; Ocean floor; Marine technology; Geology; Submersibles; Unmanned vehicles. |
| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/1990/acte-1150.pdf |
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| Clave, B; Masse, L; Carbonel, P; Tastet, Jp. |
| The La Perroche marsh is a small Holocene marsh on the south-western coast of the Oleron island (Bay of Biscay, France) presently occupied by a freshwater swamp and separated from the ocean by a continuous sand dune ridge. The study of its infill shows first basal conglomeratic deposits with calcareous pebbles on a Cenomanian rough substrate. The Holocene infill since 6000 years BP begins with a very fast sedimentation of sands. Then, the sedimentation becomes finer, with lagoonal to freshwater influences recorded by ostracods. The distribution of these deposits inside the marsh is asymmetric, with a thick sandy-gravely layer in the eastern part and a succession of sands, clays and organic layers in the western part. Communication with the sea is episodic,... |
| Tipo: Text |
Palavras-chave: Changements côtiers; Marais maritime; Holocène; Ostracodes; Sédiments; Coastal changes; Coastal salt marsh; Holocene; Ostracods; Sediments. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/00322/43349/42877.pdf |
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| Zilius, Mindaugas; De Wit, Rutger; Bartoli, Marco. |
| Sedimentation of pelagic cyanobacteria in dystrophic freshwater and oligohaline lagoons results in large inputs of labile organic matter (OM) to the benthos. We used an experimental approach to study the short-term impact of such phenomena on the benthic microbial community metabolism and on the nitrogen (N) fluxes across the sediment-water interface. We hypothesized an increase of respiratory activity, including N loss via denitrification and its recycling to the water column. Our results show that the incorporation within sediments of the settled bloom increases benthic bacterial activities. This is coupled to large DON and NH4+ effluxes, and to a comparatively smaller increase of N-2 production, while no significant effects were detected for the benthic... |
| Tipo: Text |
Palavras-chave: Cyanobacteria; Organic matter; Sediments; Benthic metabolism; DON; Denitrification. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00354/46504/74457.pdf |
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| Andrieux-loyer, Françoise; Aminot, Alain. |
| Phosphorus forms with respect to sediment characteristics, such as grain-size, and major chemical elements, were studied in French coastal marine areas (the Bay of Seine and the Loire and Gironde Estuaries).In the three areas, Fe/Al-bound phosphate (Fe/Al-P) and exchangeable phosphate (exch-P) were significantly related to the proportion of fine fraction (< 63 mum). The special association of these forms with fine particles, as well as the relationships between exch-P, Fe/Al-P and Fe showed that adsorption processes on Fe oxides had taken place. However, for similar Fe concentrations, Bay of Seine sediments showed Fe/Al-P concentrations which were four to five times higher than those found in the Loire and Gironde Estuaries. This was attributed to... |
| Tipo: Text |
Palavras-chave: Coastal areas; Major elements; Phosphorus forms; Grain size; Sediments. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/2001/publication-469.pdf |
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| Donval, Jean-pierre; Charlou, Jean-luc; Lucas, L.. |
| Headspace technique is a common method to analyze light hydrocarbons in deep marine sediments. The use of an automatic headspace sampler instead of a manual injection is the guarantee for a better repeatability and furthermore it is less time consuming. But to increase the sensitivity and therefore, to achieve a better detection limit, it is necessary to optimize the automatic headspace sampler parameters. The theory of design of experiments was applied here by studying them. As a response, methane, which is an important gas in marine sediments, was chosen for its short analysis time. Regarding the parameters for automatic headspace sampler, eight variables were selected and then, a screening of them was carried out with a fractional factorial design to... |
| Tipo: Text |
Palavras-chave: Design of experiments; Headspace technique; Gas; Sediments. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-6235.pdf |
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| Valet, Jean-pierre; Moreno, Eva; Bassinot, Franck; Johannes, Lola; Dewilde, Fabien; Bastos, Tiago; Lefort, Apolline; Venec-peyre, Marie-therese. |
| High resolution measurements of climatic and magnetic parameters have been performed on two cores from the eastern China Sea and the western Caroline Basin. On both cores, magnetic parameters show a strong imprint of climatic changes but the absence of relationship between the inclination and the bulk density indicates that the directional changes do not depend on lithology. A weak 100 ka cycle is present in the China sea inclination variations, but this period is not in phase with the orbital eccentricity and thus not relevant. All normalization parameters yielded similar estimates of relative paleointensity (RPI), but we have noticed the persistence of climatic components in the signal. Principal Component Analysis (PCA) applied to different parameters... |
| Tipo: Text |
Palavras-chave: Magnetization; Paleointensity; Paleomagnetism; Sediments. |
| Ano: 2011 |
URL: https://archimer.ifremer.fr/doc/00227/33818/32481.pdf |
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| Lim, Aaron; Kane, Adam; Arnaubec, Aurelien; Wheeler, Andrew J.. |
| Cold-water coral (CWC) habitats are commonly regarded as hotspots of biodiversity in the deep-sea. However, a standardised approach to monitoring the effects of climate change, anthropogenic impact and natural variability through video-surveying on these habitats is poorly-established. This study is the first attempt at standardising a cost-effective video-survey design specific to small CWC mounds in order to accurately determine the proportion of facies across their surface. The Piddington Mound of the Moira Mounds, Porcupine Seabight, offshore Ireland has been entirely imaged by downward-facing video in 2011 and 2015. The 2011 video data is navigated into a full-mound, georeferenced video mosaic. A quadrat-based manual classification of this video... |
| Tipo: Text |
Palavras-chave: Cold water corals; Mounds; Video survey design; Sediments; Habitat mapping. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00403/51482/53728.pdf |
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| Bharathi, Pal; Oak, S; Chandramohan, D. |
| Sulfate-reducing bacteria (SRB) have been enumerated and physiologically characterized in three mangrove stations along the Zuari estuary. The substrates for counting were lactate, acetate, propionate, butyrate and benzoate. Benzoate oxidizing SRB were widespread and occurred in numbers up to 6.62 x 10(3)/g dry sediment. The next highest in number were lactate utilizing SRB. On an average there were more propionate and butyrate utilizers than acetate utilizers. While Agasaim at the mouth of the estuary harboured highest number of lactate oxidizers, none were detected at Mirabaug upstream during the samplings. The SRB shared many characteristics with Desulfovibrio desulfuricans, D. desulfuricans aestuarii, D. salexigens, Desulfotomaculum orientis, D.... |
| Tipo: Text |
Palavras-chave: Bactéries; Sulfato-réductrices; Estuaire; Sédiments; Mangrove; Mangrove-Bacteria; Sulfate-reducers; Estuary; Sediments. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00323/43395/43103.pdf |
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| Meyerreil, L; Graf, G. |
| The seasonal development of benthic communities was followed in a coastal marine sediment of the Kiel Bight (Baltic Sea; FRG). Total benthic biomass, (ATP), bacterial biomass, overall benthic activity (heat production), and enzymatic decomposition rates of carbohydrate (d-amylase activity) followed a seasonal cycle strongly related to certain events in the sediment. Among these, the input of the phytoplankton blooms in autumn and spring, the accumulation of organic material during winter, and changes in the physical characteristics of the sediment turned out to be most important for the development of benthic biomass and activity. Processes within the benthic community occurred in very short time scales (within days). |
| Tipo: Text |
Palavras-chave: Bacteria; Organic matter; Sediments; Bioenergetics; Enzymatic activity; Biomass. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/1984/acte-944.pdf |
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| Registros recuperados: 132 | |
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